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One day, a baby snail found that he had to carry a big and heavy shell at any time. He asked his mother, “Why was I born with a shell? It 1． (grow) so hard and heavy.” His mother said, “Because we don’t have bones(骨头) 2． (support) us. We move slowly, so we need a shell to protect us.”

The baby snail asked again, “The caterpillar (毛毛虫) has no bones, either, and she can’t move quickly. Why can she live 3． a shell?” The mother snail answered 4． (patient), “That’s because she will become a butterfly. She can fly high into 5． sky which can protect her.”

The baby snail then cried, “We are so poor! We have no 6． (protect) like that!” His mother smiled at him, “That’s why we have a shell. My dear, imagine 7． we don’t have the shell, what will happen to us? Our bodies will be 8． (dry) out by the hot sun and we’ll have nowhere to sleep. What’s 9． (bad), we’ll die in the heavy rain. We don’t depend on the sky. We should depend on 10． (we).”